CN115284971A - Vehicle-mounted battery thermal management control system and method - Google Patents
Vehicle-mounted battery thermal management control system and method Download PDFInfo
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- CN115284971A CN115284971A CN202210853490.4A CN202210853490A CN115284971A CN 115284971 A CN115284971 A CN 115284971A CN 202210853490 A CN202210853490 A CN 202210853490A CN 115284971 A CN115284971 A CN 115284971A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 68
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims description 28
- 238000005057 refrigeration Methods 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000000110 cooling liquid Substances 0.000 description 9
- 238000007599 discharging Methods 0.000 description 9
- 239000000523 sample Substances 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
- B60H1/00278—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit for the battery
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00485—Valves for air-conditioning devices, e.g. thermostatic valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H1/00885—Controlling the flow of heating or cooling liquid, e.g. valves or pumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
- B60H2001/00307—Component temperature regulation using a liquid flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The invention relates to a vehicle-mounted battery thermal management control system and method, wherein an outlet of a variable frequency compressor is connected with an a port of a four-way reversing valve, a b port of the four-way reversing valve is connected with an outdoor heat exchanger, the outdoor heat exchanger is respectively connected with a first bidirectional expansion valve and a second bidirectional expansion valve through pipelines, the first bidirectional expansion valve is connected with an indoor heat exchanger through a pipeline, the second bidirectional expansion valve is connected with a heat exchanger in a battery unit through a pipeline, the indoor heat exchanger and the heat exchanger of the battery unit are both connected with a d port of the four-way reversing valve through pipelines, and a c port of the four-way reversing valve is connected with an inlet of the variable frequency compressor through a gas-liquid separator through a pipeline. The battery and the passenger compartment are jointly used as refrigerating or heating demand ends, the battery and the passenger compartment are respectively in different heat/cold demand states to divide the working mode of the heat management system, and the reversing valve and the bidirectional expansion valve are utilized to change the flow direction of working media in the system so as to switch the working mode, so that the heat/cold of the working media is reasonably distributed.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted battery units, in particular to a vehicle-mounted battery thermal management control system and method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The vehicle-mounted battery thermal management control system is a component which is mounted on a vehicle-mounted battery and is used for controlling the thermal balance of the battery and avoiding high-temperature accidents. In the current vehicle-mounted battery thermal management control system, three cooling modes of natural cooling, forced air cooling and cooling liquid cooling are adopted as common heat dissipation modes, and two modes of heating film heating and cooling liquid heating are adopted as common heating modes. However, the above heat dissipation methods have no significant effect on solving the problem that the temperature rise rate is rapidly increased when the power battery is charged and discharged quickly. Heating membrane heating is being eliminated by battery manufacturers gradually due to high failure rate and large safety risk coefficient. The liquid heat of the cooling liquid is subjected to user scaling due to the problems of low heat exchange efficiency and low temperature rise rate. When the cooling liquid is used for cooling, the system pipeline and the heat exchanger are easy to freeze.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a vehicle-mounted battery thermal management control system and a vehicle-mounted battery thermal management control method, wherein a battery and a passenger compartment are used as a refrigerating or heating demand end, the battery and the passenger compartment are respectively in different heat/cold demand states to divide the working mode of the thermal management system, and a reversing valve and a bidirectional expansion valve are used for changing the flow direction of a working medium in the system so as to switch the working mode, so that the heat/cold of the working medium is reasonably distributed.
In order to achieve the purpose, the invention adopts the following technical scheme:
a first aspect of the present invention provides an in-vehicle battery thermal management control system, including:
the outlet of the frequency conversion compressor is connected with an a port of the four-way reversing valve, a b port of the four-way reversing valve is connected with an outdoor heat exchanger, the outdoor heat exchanger is respectively connected with a first bidirectional expansion valve and a second bidirectional expansion valve through pipelines, the first bidirectional expansion valve is connected with an indoor heat exchanger through a pipeline, the second bidirectional expansion valve is connected with a heat exchanger in the battery unit through a pipeline, the indoor heat exchanger and the heat exchanger of the battery unit are both connected with a d port of the four-way reversing valve through pipelines, and a c port of the four-way reversing valve is connected with the inlet of the frequency conversion compressor through a gas-liquid separator through a pipeline.
The outdoor heat exchanger is connected with the outdoor fan.
And a drying filter is arranged on a pipeline connecting the outdoor heat exchanger with the first bidirectional expansion valve and the second bidirectional expansion valve.
The indoor heat exchanger is connected with the heater and the indoor fan.
And pressure sensors are arranged at the inlet and the outlet of the variable-frequency compressor.
A second aspect of the present invention provides a method for implementing thermal management based on the above system, including the following steps:
acquiring the temperature in the battery unit, and switching the heat management working mode through a first bidirectional expansion valve, a second bidirectional expansion valve and a four-way reversing valve according to the relationship between the maximum value and the average value of the temperature and a set value, wherein the heat management working mode specifically comprises the following steps:
the first mode is as follows: a battery and passenger compartment cooling mode;
and a second mode: a battery cooling mode;
and a third mode: a battery and passenger compartment heating mode;
and a fourth mode: a battery heating mode;
and a fifth mode: a passenger compartment cooling mode;
mode six: a passenger compartment heating mode;
mode seven: standby mode
When maximum value of temperature T max Not less than the first set value T 1 And the average value T of the temperature mean Not less than the second set value T 2 Sending a refrigeration request, if receiving the refrigeration requirement of the passenger area at the same time, starting the frequency conversion compressor, conducting the port a and the port b of the four-way valve, conducting the port c and the port d, and starting the first bidirectional expansion valve and the second bidirectional expansion valveAdjusting the opening according to the working condition, and entering a first mode; if no passenger compartment refrigeration demand is received, the first bidirectional expansion valve is closed to enter mode two.
When the minimum value T of the temperature min Is not more than a third set value T 3 And the average value T of the temperature mean Is not more than a fourth set value T 4 If a heating request is sent, if a heating requirement of a passenger area is received at the same time, the variable frequency compressor is started, an a port and a d port of the four-way valve are communicated, a c port and a b port of the four-way valve are communicated, the first bidirectional expansion valve and the second bidirectional expansion valve are opened, the opening degree is adjusted according to the working condition, and a third mode is entered; if the passenger compartment heating demand is not received, the first bidirectional expansion valve is closed, and the mode four is entered.
When only the requirement of the passenger area for refrigeration is received, the variable frequency compressor is started, the port a and the port b of the four-way valve are communicated, the port c and the port d of the four-way valve are communicated, the first bidirectional expansion valve is started and the opening degree is adjusted according to the working condition, the second bidirectional expansion valve is closed, and the mode is entered into the fifth mode.
When only the heating requirement of a passenger area is received, the variable frequency compressor is started, the port a and the port d of the four-way valve are communicated, the port c and the port b of the four-way valve are communicated, the first bidirectional expansion valve is started and the opening degree is adjusted according to the working condition, the second bidirectional expansion valve is closed, and a sixth mode is entered. Mode seven is entered when no request is received.
Compared with the prior art, the above one or more technical schemes have the following beneficial effects:
1. the system uses the battery and the passenger compartment as a refrigerating or heating demand end together, divides the working modes of the heat management system by the condition that the battery and the passenger compartment are respectively in different heat/cold demand states, changes the flow direction of working media in the system by utilizing the reversing valve and the bidirectional expansion valve so as to switch the working modes, reasonably distributes the heat/cold of the working media, thereby maintaining the temperature of the battery in a proper interval and improving the charging and discharging efficiency.
2. When the working mode is switched, the refrigeration requirement of the battery is supplemented by the refrigeration requirement of the passenger area, so that the problem that pipelines and heat exchangers in the traditional cooling liquid cooling system are easy to freeze is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to illustrate an exemplary embodiment of the invention and not to limit the invention.
Fig. 1 is a schematic diagram of a battery thermal management system according to one or more embodiments of the present invention;
FIG. 2 is a schematic workflow diagram of a battery thermal management system provided by one or more embodiments of the invention;
in the figure: 1. a variable frequency compressor; 2. a first pressure sensor; 3. a four-way reversing valve; 4. an outdoor fan; 5. an outdoor heat exchanger; 6. drying the filter; 7. a first bidirectional expansion valve; 8. a second bidirectional expansion valve; 9. a battery cell; 10. a PTC heater; 11. an indoor fan; 12. an indoor heat exchanger; 13. a gas-liquid separator; 14. a second pressure sensor.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, in the current thermal management control system for the vehicle-mounted battery, three cooling manners, namely natural cooling, forced air cooling and cooling by the cooling liquid, are adopted as common heat dissipation manners, and the two common heating manners are heating film heating and cooling liquid heating. The heat dissipation modes have no obvious effect on solving the problem that the temperature rise rate is rapidly increased when the power battery is rapidly charged and discharged. When cooling liquid is adopted for cooling, pipelines and heat exchangers of a cooling system are easy to freeze due to the cold distribution problem.
Therefore, the following embodiments provide a vehicle-mounted battery thermal management control system and a vehicle-mounted battery thermal management control method, which solve the problem that a system pipeline and a heat exchanger are easy to freeze in a direct cooling and direct heating mode, intelligently distribute refrigeration capacity through charging and discharging current, and maintain the temperature of a battery in a proper interval by combining different working modes of battery thermal management, so that the charging and discharging efficiency is improved.
The first embodiment is as follows:
as shown in fig. 1, an in-vehicle battery thermal management control system includes:
the outlet of the variable frequency compressor 1 is connected with the port a of the four-way reversing valve 3, the port b of the four-way reversing valve 3 is connected with the outdoor heat exchanger 5, the outdoor heat exchanger 5 is respectively connected with the first bidirectional expansion valve 7 and the second bidirectional expansion valve 8 through pipelines, the first bidirectional expansion valve 7 is connected with the indoor heat exchanger 12 through a pipeline, the second bidirectional expansion valve 8 is connected with the heat exchanger in the battery unit 9 through a pipeline, the indoor heat exchanger 12 and the heat exchanger of the battery unit 9 are both connected with the port d of the four-way reversing valve 3 through pipelines, and the port c of the four-way reversing valve 3 is connected with the inlet of the variable frequency compressor 1 through the gas-liquid separator 13 through a pipeline.
The outdoor heat exchanger 5 is connected with the outdoor fan 4.
A drying filter 6 is arranged on a pipeline connecting the outdoor heat exchanger 5 with the first two-way expansion valve 7 and the second two-way expansion valve 8.
The indoor heat exchanger 12 is connected to the PTC heater 10 and the indoor fan 11.
The inlet and the outlet of the inverter compressor 1 are provided with pressure sensors, in this embodiment, the first pressure sensor 2 is located on the outlet pipeline of the inverter compressor 1, and the second pressure sensor 14 is located on the inlet pipeline of the inverter compressor 1.
Specifically, the method comprises the following steps:
the first bidirectional expansion valve 7 is connected with one end of an indoor heat exchanger 12, a PTC heater 10 and an indoor fan 11 are arranged on one side of the indoor heat exchanger 12, the other end of the indoor heat exchanger 12 is connected with a port d of a four-way reversing valve 3, the port d of the four-way reversing valve 3 is connected with an inlet of a gas-liquid separator 13, an outlet of the gas-liquid separator 13 is connected with an inlet of a variable frequency compressor 1, and a first pressure sensor 2 and a second pressure sensor 14 are arranged in a pipeline connected with the input and the output of the variable frequency compressor 1;
the other end of the second bidirectional expansion valve 8 is connected with a battery unit 9, the battery unit 9 is generally provided with a plurality of battery packs, each battery pack comprises a direct-cooling direct-heating heat exchanger, a plurality of temperature sensing detection points and a bus current sensor, and the other end of the battery unit 9 is connected with a port d of the four-way reversing valve 3 after being converged with the indoor heat exchanger 12.
The system uses the battery and the passenger compartment as the refrigerating or heating demand ends, divides the working modes of the heat management system by the condition that the battery and the passenger compartment are respectively in different heat/cold demand states, and changes the flow direction of the working medium in the system by utilizing the reversing valve and the bidirectional expansion valve so as to switch the working modes, so that the heat/cold of the working medium is reasonably distributed.
When the working mode is switched, the refrigeration requirement of the battery is supplemented by the refrigeration requirement of the passenger area, so that the problem that pipelines and heat exchangers in the traditional cooling liquid cooling system are easy to freeze is solved.
Example two:
as shown in fig. 2, the present embodiment provides a method for implementing thermal management based on the system in the first embodiment, including the following steps:
acquiring the temperature in the battery unit, and switching the thermal management working modes through a first bidirectional expansion valve 7, a second bidirectional expansion valve 8 and a four-way reversing valve 3 according to the relationship between the maximum value and the average value of the temperature and a set value, wherein the thermal management working modes comprise:
the first mode is as follows: a battery and passenger compartment cooling mode;
and a second mode: a battery cooling mode;
and a third mode: a battery and passenger compartment heating mode;
and a fourth mode: a battery heating mode;
and a fifth mode: a passenger compartment cooling mode;
mode six: a passenger compartment heating mode;
mode seven: a standby mode.
Specifically, the method comprises the following steps:
in this embodiment, the controller collects and monitors the temperature of all temperature sensing probe points in the plurality of battery packs, and when the maximum value T of the temperature of the probe points is reached max Is greater than or equal to a set value T 1 And the average value T of the probe point temperature mean Is greater than or equal to a set value T 2 If the controller sends a refrigeration request, and meanwhile, when a passenger area refrigeration demand is received, the variable frequency compressor 1 is started, the port a and the port b of the four-way valve 3 are communicated, the port c and the port d are communicated, the first bidirectional expansion valve 7 and the second bidirectional expansion valve 8 are started, the opening degrees are adjusted according to working conditions, and the heat management working mode enters a mode I; and if the passenger area refrigeration demand is not received, the first bidirectional expansion valve is closed, and the heat management working mode enters a second mode.
In this embodiment, when the minimum value T of the probe point temperature min Less than or equal to the set value T 3 And the average value T of the probe point temperature mean Less than or equal to the set value T 4 If the controller sends a heating request, and meanwhile, when a passenger area heating demand is received, the variable frequency compressor 1 is started, the port a and the port d of the four-way valve 3 are communicated, the port c and the port b are communicated, the first bidirectional expansion valve 7 and the second bidirectional expansion valve are opened by 8, the opening degree is adjusted according to the working condition, and the heat management working mode enters a third mode; if the passenger area heating demand is not received, the first bidirectional expansion valve is closed, and the heat management working mode enters a fourth mode.
In this embodiment, when only a passenger compartment refrigeration demand is received, the inverter compressor 1 is turned on, the port a and the port b of the four-way valve 3 are connected, the port c and the port d are connected, the first bidirectional expansion valve 7 is turned on, the opening degree is adjusted according to the working condition, the second bidirectional expansion valve 8 is turned off, and the thermal management working mode enters the fifth mode.
In this embodiment, when only a passenger area heating demand is received, the inverter compressor 1 is turned on, the port a and the port d of the four-way valve 3 are connected, the port c and the port b are connected, the first bidirectional expansion valve 7 is turned on, the opening degree is adjusted according to the working condition, the second bidirectional expansion valve 8 is turned off, and the thermal management working mode enters the sixth mode. When no request is received, the thermal management mode of operation enters mode seven.
In the embodiment, the pressure of the cooling pipeline is monitored through the first pressure sensor 2 and the second pressure sensor 14, and the variable frequency compressor 1 is closed when the pressure reaches a set threshold value, so that the pipeline and the heat exchanger are prevented from being frozen.
In the present embodiment, when the passenger compartment temperature increase rate is lower than the threshold value X in the third and sixth operation modes, the PTC heater 10 is turned on for auxiliary heating. When the power battery is in the working mode one, the controller reads the battery charging and discharging current sent by the bus current sensor, and calculates the required refrigerating capacity in real time by combining a table look-up method, and dynamically adjusts the opening degrees of the first bidirectional expansion valve 7 and the second bidirectional expansion valve 8, so that the effect of the power battery during high-rate charging and discharging is ensured. In the second mode, the controller adjusts the output power of the inverter compressor 1 in real time according to the charging and discharging current of the battery, so that the temperature of the battery is maintained in a proper interval, and the charging and discharging efficiency is improved.
The first mode, the second mode and the fifth mode are refrigeration modes, in the refrigeration mode, the compressor 1 compresses a working medium to raise the temperature and pressure, the compressed working medium enters the outdoor heat exchanger 5 through the port a and the port b of the four-way valve 3 to be cooled to a medium-temperature high-pressure working medium, the working medium is expanded and absorbed through the two parallel two-way expansion valves 7 and 8 to form a low-temperature medium-pressure working medium, the working medium enters the indoor heat exchanger 12 and the heat exchanger inside the battery unit 9 respectively through respective pipelines to refrigerate the battery and the passenger compartment according to requirements, and the refrigerated working medium returns to the compressor 1 through the port d, the port c and the gas-liquid separator 13 of the four-way valve 3 to continue circulation.
The third mode, the fourth mode and the sixth mode are heating modes, in the heating mode, the compressor 1 compresses a working medium to raise the temperature and pressure, the compressed working medium respectively enters the indoor heat exchanger 12 and the heat exchanger inside the battery unit 9 through the port a and the port d of the four-way valve 3, the heat is released to meet the heating requirements of the battery and the passenger compartment to form a medium-temperature high-pressure working medium, whether the working medium flows through the indoor heat exchanger 12 and the heat exchanger inside the battery unit 9 is controlled through two parallel two-way expansion valves 7 and 8, the working medium expands to absorb heat to form a low-temperature medium-pressure working medium, the working medium enters the outdoor heat exchanger 5 through a pipeline to absorb the heat of the outdoor environment, and the heat-absorbed working medium returns to the compressor 1 through the port b, the port c and the gas-liquid separator 13 to continue circulation.
In the circulation, the flow direction of the working medium in the compressor is unchanged, the flow direction of the working medium between the indoor heat exchanger and the outdoor heat exchanger is changed through the reversing valve, the refrigeration/heating mode is switched by matching with bidirectional expansion, and meanwhile, auxiliary heating is realized by utilizing the heater in the heating mode.
The system uses the battery and the passenger compartment as the refrigerating or heating demand ends, divides the working modes of the heat management system by using the battery and the passenger compartment in different heat/cold demand states respectively, changes the flow direction of the working medium in the system by using the reversing valve and the bidirectional expansion valve so as to switch the working modes, reasonably distributes the heat/cold of the working medium, maintains the temperature of the battery in a proper interval, and improves the charging and discharging efficiency.
Pipeline and heat exchanger are easily frozen in traditional coolant liquid cooling system, under the refrigeration state, vapor in the air can gather on microthermal pipeline and heat exchanger surface, when the liquid water that vapor condensed off when cold volume distribution is inhomogeneous has not come to reach when discharging, just become ice by microthermal pipeline and heat exchanger cooling, thereby the problem of freezing appears, and above-mentioned embodiment is when switching operating mode, utilize the refrigeration demand of passenger district to supply the refrigeration demand of battery, open the refrigeration demand that an expansion valve priority satisfied battery earlier, open another expansion valve rather than parallelly connected when the refrigeration demand increases in order to satisfy the refrigeration demand in passenger cabin, make pipeline and heat exchanger surface condense the liquid water that gets off discharge, thereby avoid the problem that pipeline and heat exchanger are easily frozen in traditional coolant liquid cooling system.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The vehicle-mounted battery thermal management control system is characterized in that: the outlet of the four-way reversing valve is connected with an opening a of the four-way reversing valve, an opening b of the four-way reversing valve is connected with an outdoor heat exchanger, the outdoor heat exchanger is respectively connected with a first bidirectional expansion valve and a second bidirectional expansion valve through pipelines, the first bidirectional expansion valve is connected with an indoor heat exchanger through a pipeline, the second bidirectional expansion valve is connected with a heat exchanger in the battery unit through a pipeline, the indoor heat exchanger and the heat exchanger of the battery unit are both connected with an opening d of the four-way reversing valve through pipelines, and an opening c of the four-way reversing valve is connected with an inlet of the frequency conversion compressor through a gas-liquid separator through a pipeline.
2. The vehicular battery thermal management control system according to claim 1, wherein: the outdoor heat exchanger is connected with an outdoor fan.
3. The in-vehicle battery thermal management control system of claim 1, wherein: and a drying filter is arranged on a pipeline connecting the outdoor heat exchanger with the first bidirectional expansion valve and the second bidirectional expansion valve.
4. The vehicular battery thermal management control system according to claim 1, wherein: the indoor heat exchanger is connected with the heater and the indoor fan.
5. The in-vehicle battery thermal management control system of claim 1, wherein: and the inlet and the outlet of the variable frequency compressor are both provided with pressure sensors.
6. Method for implementing thermal management based on a system according to any of claims 1-5, comprising the steps of:
acquiring the temperature in the battery unit, and switching the heat management working mode through a first bidirectional expansion valve, a second bidirectional expansion valve and a four-way reversing valve according to the relationship between the maximum value and the average value of the temperature and a set value, wherein the heat management working mode specifically comprises the following steps:
the first mode is as follows: a battery and passenger compartment cooling mode;
and a second mode: a battery cooling mode;
and a third mode: a battery and passenger compartment heating mode;
and a fourth mode: a battery heating mode;
and a fifth mode: a passenger compartment cooling mode;
mode six: a passenger compartment heating mode;
mode seven: a standby mode.
7. The mobile method according to claim 6, wherein: when the maximum value of the temperature is not less than a first set value and the average value of the temperature is not less than a second set value, sending a refrigeration request, if the refrigeration requirements of the passenger area are received at the same time, starting the variable frequency compressor, conducting an a port and a b port of the four-way valve, conducting a c port and a d port, starting the first bidirectional expansion valve and the second bidirectional expansion valve, adjusting the opening degrees according to the working conditions, and entering a first mode; if no passenger compartment refrigeration demand is received, the first bidirectional expansion valve is closed and enters a second mode.
8. The mobile method according to claim 6, wherein: when the minimum value of the temperature is not more than a third set value and the average value of the temperature is not more than a fourth set value, a heating request is sent, if a passenger area heating demand is received at the same time, the variable frequency compressor is started, an a port and a d port of the four-way valve are communicated, a c port and a b port are communicated, the first bidirectional expansion valve and the second bidirectional expansion valve are started and the opening degrees are adjusted according to working conditions, and a third mode is entered; if the passenger compartment heating demand is not received, the first bidirectional expansion valve is closed, and mode four is entered.
9. The mobile method according to claim 6, wherein: when only the requirement of the passenger area for refrigeration is received, the variable frequency compressor is started, the port a and the port b of the four-way valve are communicated, the port c and the port d of the four-way valve are communicated, the first bidirectional expansion valve is started and the opening degree is adjusted according to the working condition, the second bidirectional expansion valve is closed, and the mode is entered into the fifth mode.
10. The mobile method according to claim 6, wherein: when only the heating requirement of a passenger area is received, the variable frequency compressor is started, the port a and the port d of the four-way valve are communicated, the port c and the port b of the four-way valve are communicated, the first bidirectional expansion valve is opened and the opening degree is adjusted according to the working condition, the second bidirectional expansion valve is closed, and a sixth mode is entered; mode seven is entered when no request is received.
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| CN202210853490.4A CN115284971A (en) | 2022-07-20 | 2022-07-20 | Vehicle-mounted battery thermal management control system and method |
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| CN202210853490.4A CN115284971A (en) | 2022-07-20 | 2022-07-20 | Vehicle-mounted battery thermal management control system and method |
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